You'll want to stay on top of monitoring it for pitch counts and fatigue. You may want/need to shorten the pitch counts for your A starters because they'll be going on only three days rest instead of the more standard four.

I've used tandems on occasion with good success. Like tec said, it just takes more monitoring and juggling. What I usually do is set my pitch counts to 50-70 for all of the tandem pitchers, with a pull setting of 4 or 5.

i'm tandeming now. 5 lower stamina starters, 1 Super RP, 1 mop-up pitcher. Super RP is Tandem B whenever he'll be 100%. The other guys rotate between A and B whenever they're ready. The mop-up guy goes to Tandem B when only one guy is at 100%. Pitch count is set to what their stamina is. I switched last year and it actually helped get this guy 30 more innings than in a regular 5 man rotation.

I've found working with tandems will often need more frequent tinkering and adjustments to your staff. If you're the type who can often check into your team, that works out well. If you have trouble making time to check in that could be a problem.

yea, I wasn't a fan of his contract either, but since it's only 1 yr and I needed somebody capable of some sort of offense, I went ahead and did it. Plus, there is the chance I get some compensation for letting him walk next year